feat(bash): add indents query

It's pretty basic at the moment but already makes working with bash
scripts way easier.

tests/indent/bash/test.sh

@@ -0,0 +1,39 @@
+for i in 1 2 3; do
+    if [[ true ]]; then
+        echo "asd"
+    elif [ true ]; then
+        echo "dsa"
+    else
+        echo ""
+    fi
+    echo $i
+done
+
+while true; do
+    break
+done
+
+case $foo in
+    a) echo a ;;
+    b) echo b ;;
+esac
+
+function x() {
+    echo x
+}
+
+y() {
+    echo y
+}
+
+{
+    echo z
+}
+
+(
+    echo subshell
+)
+
+A=$(
+    echo command substitution
+)